I have used this muzzle brake on my big game rifle. The YouTube video demonstration below is done by the inventor shooting my rifle. - Len
The Muscle Brake was designed to be extremely shooter friendly. With the first port being 90 degrees it shears the back blast off from the angled ports, to prevent the "blast/concussion" effect from distracting the shooter. These brake are made of 416SS, and hardened to 30 Rockwell. Benefits to the Muscle brake are increased recoil reduction, no back blast to the shooter as compared to typical angle port and radial port brakes, and the brake to barrel joint can be tapered and blended for a seamless appearance.
Be sure and read all the positive reviews up above.
Mini Magnum Muscle Brake - slabbed - Now fit a Muscle brake to your factory magnum rifle. Designed to fit factory sporter weight barrel contours with muzzle dia. of .620" to .850". Designed to work with magnum cartridges, yet maintain a smaller profile. Perfect for sporter barrels in WSM and standard Magnum cartridges. It will also reduce the recoil on the Ultra Mags to an acceptable level. (9/16x24 TPI)
Original 3 Port Muscle Brake - slabbed - This brake works on anything from the 243 to the 338 Lapua. 45 to 95 gr of powder is covered pretty well by the one and only original 3 port muscle brake. Fits muzzle diameter of .685" - .990". (5/8x24 TPI)
These muzzle brakes should be installed by an experienced gunsmith.
These muzzle brakes need to be timed to the orientation of the rifle, the port openings should lay horizontally as the rifle is in the firing position. This allows the blast to be directed both right and left
The bullet passage hole must be opened up with a small boring bar to between .020" - .030" larger than bullet diameter. The installer must ensure that the projectile leaves the brake cleanly.